Objective 100.035% of exam

Layer 3 Technologies

300-410 Practice Questions

Layer 3 Technologies covers how Cisco IOS and IOS XE routers build and manipulate the routing table: OSPF, EIGRP, BGP, route redistribution, route maps, PBR, and IPv6 routing. ENARSI tests this through configuration and troubleshooting scenarios, so you must read show output, spot the broken statement, and know which command fixes it.

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What this objective tests

300-410 Layer 3 Technologies — Key Topics

You must configure and troubleshoot OSPF, EIGRP, BGP, redistribution, and PBR from CLI show output. The single most important thing is verifying the exact match or adjacency condition before changing policy, because one wrong sequence number or K-value breaks the whole path.

OSPFv3 and OSPFv2 adjacency, area types, virtual links, and passive-interface behavior
EIGRP named mode configuration, K-values, variance, and feasible successor selection
BGP path selection, route maps, communities, local preference, and AS-path filtering
Route redistribution, PBR with route-map and set ip next-hop, and VRF-aware routing

Common exam traps

Where candidates lose marks on Layer 3 Technologies

⚠Mixing EIGRP classic and named mode commands, or mismatching K-values, which silently blocks adjacency formation
⚠Forgetting that route-map match statements are ANDed and that a missing permit sequence drops all unmatched routes
⚠Assuming PBR overrides the routing table without checking that the route-map is applied to the correct interface and direction

300-410 Layer 3 Technologies — Practice Questions

30 questions from this objective · 35% of your 300-410 exam

Question 2hardmultiple choice

Study the full EIGRP explanation →

A network administrator is troubleshooting an EIGRP network where a router is not forming an adjacency with a neighbor. The administrator verifies that the interfaces are up, IP connectivity exists, and the autonomous system numbers match. Which of the following is the most likely cause of the adjacency failure?

Question 3hardmultiple choice

Study the full EIGRP explanation →

A network administrator is troubleshooting a Cisco IOS router running EIGRP. The router is not forming an adjacency with a neighbor. The administrator verifies that the interfaces are up, IP addresses are correct, and no ACLs are blocking traffic. The output of 'show ip eigrp interfaces' shows the interface is enabled for EIGRP. What is the most likely reason for the adjacency failure?

Question 4hardmultiple choice

Layer 3 Technologies

300-410 Layer 3 Technologies — Key Topics

Where candidates lose marks on Layer 3 Technologies

300-410 Layer 3 Technologies — Practice Questions

A network administrator is configuring OSPFv3 on a Cisco router. The router is connected to an IPv6 network and must form an adjacency with a neighbor. The administrator notices that the neighbor relationship is stuck in EXSTART state. Which of the following is the most likely cause?

A network engineer is configuring OSPFv3 on a dual-stack router. The engineer wants to enable OSPFv3 on an interface and ensure that it participates in the OSPFv3 process. Which two commands are required to accomplish this? (Choose two.)

A network engineer configures a Cisco router with the command `ip route 10.1.1.0 255.255.255.0 192.168.1.2`. Later, the engineer adds `ip route 10.1.1.0 255.255.255.0 192.168.2.2 10`. Which route will be installed in the routing table, and why?

A network engineer is configuring a Cisco router to redistribute routes from OSPF into EIGRP. The engineer wants to ensure that only specific OSPF routes are redistributed and that the EIGRP metric is set appropriately. Which command should be used to accomplish this?

A network administrator is deploying OSPFv3 in a dual-stack IPv4/IPv6 environment. The administrator wants to ensure that OSPFv3 operates correctly and securely. Which two statements about OSPFv3 are true? (Choose two.)

A network technician is configuring a static route on a Cisco router. The technician wants to ensure that the route is only used if the next-hop address is reachable via a specific interface. Which command should be used?

A network technician is configuring a Cisco router with a static route to a remote network. The technician wants the static route to be used only if the primary route learned via OSPF fails. Which command should be used?

A network engineer is implementing policy-based routing (PBR) on a Cisco router. The engineer wants to route traffic from a specific subnet to a next-hop that is not in the routing table. Which action must be taken to ensure that PBR works correctly?

A network engineer is configuring BGP on a Cisco IOS XE router. The engineer wants to ensure that the router prefers routes learned from a specific eBGP peer over routes learned from another eBGP peer. Which two BGP attributes can be manipulated to influence this decision? (Choose two.)

A network engineer is configuring OSPFv3 on a Cisco IOS router. The engineer wants to enable OSPFv3 on an interface and ensure that it participates in the OSPFv3 process. Which command is required on the interface?

A network administrator is troubleshooting an EIGRP adjacency that is stuck in the ACTIVE state. The adjacency is between two routers on a LAN segment. Which two actions should the administrator take to resolve this issue? (Choose two.)

A network engineer is configuring EIGRP on a Cisco IOS XE router. The engineer wants to ensure that the router does not advertise a specific prefix to any EIGRP neighbor. Which configuration should be used?

A network engineer is deploying MPLS Layer 3 VPNs. The engineer needs to configure the provider edge (PE) routers to support multiple VRFs. Which two statements about VRF configuration on Cisco IOS routers are true? (Choose two.)

A network engineer is troubleshooting an OSPFv3 network. Router R1 is configured with `ipv6 unicast-routing` and OSPFv3 is enabled on all interfaces. R1's neighbor table shows a neighbor in EXSTART state, but the adjacency never progresses to FULL. What is the most likely cause?

A network administrator is configuring a route-map to control redistribution from OSPF into EIGRP. The goal is to redistribute only routes with a tag of 100 and set their metric to bandwidth 1000, delay 100, reliability 255, loading 1, and MTU 1500. Which route-map configuration accomplishes this?

A network engineer is troubleshooting OSPFv3 adjacency issues on a Cisco IOS XE router. The engineer suspects that OSPFv3 is not forming an adjacency because of mismatched parameters. Which two parameters must match for an OSPFv3 adjacency to form? (Choose two.)

All 300-410 Objectives

Layer 3 Technologies

300-410 Layer 3 Technologies — Key Topics

Where candidates lose marks on Layer 3 Technologies

300-410 Layer 3 Technologies — Practice Questions

A network administrator is configuring OSPFv3 on a Cisco router. The router is connected to an IPv6 network and must form an adjacency with a neighbor. The administrator notices that the neighbor relationship is stuck in EXSTART state. Which of the following is the most likely cause?

A network engineer is configuring OSPFv3 on a dual-stack router. The engineer wants to enable OSPFv3 on an interface and ensure that it participates in the OSPFv3 process. Which two commands are required to accomplish this? (Choose two.)

A network engineer configures a Cisco router with the command `ip route 10.1.1.0 255.255.255.0 192.168.1.2`. Later, the engineer adds `ip route 10.1.1.0 255.255.255.0 192.168.2.2 10`. Which route will be installed in the routing table, and why?

A network engineer is configuring a Cisco router to redistribute routes from OSPF into EIGRP. The engineer wants to ensure that only specific OSPF routes are redistributed and that the EIGRP metric is set appropriately. Which command should be used to accomplish this?

A network administrator is deploying OSPFv3 in a dual-stack IPv4/IPv6 environment. The administrator wants to ensure that OSPFv3 operates correctly and securely. Which two statements about OSPFv3 are true? (Choose two.)

A network technician is configuring a static route on a Cisco router. The technician wants to ensure that the route is only used if the next-hop address is reachable via a specific interface. Which command should be used?

A network technician is configuring a Cisco router with a static route to a remote network. The technician wants the static route to be used only if the primary route learned via OSPF fails. Which command should be used?

A network engineer is implementing policy-based routing (PBR) on a Cisco router. The engineer wants to route traffic from a specific subnet to a next-hop that is not in the routing table. Which action must be taken to ensure that PBR works correctly?

A network engineer is configuring BGP on a Cisco IOS XE router. The engineer wants to ensure that the router prefers routes learned from a specific eBGP peer over routes learned from another eBGP peer. Which two BGP attributes can be manipulated to influence this decision? (Choose two.)

A network engineer is configuring OSPFv3 on a Cisco IOS router. The engineer wants to enable OSPFv3 on an interface and ensure that it participates in the OSPFv3 process. Which command is required on the interface?

A network administrator is troubleshooting an EIGRP adjacency that is stuck in the ACTIVE state. The adjacency is between two routers on a LAN segment. Which two actions should the administrator take to resolve this issue? (Choose two.)

A network engineer is configuring EIGRP on a Cisco IOS XE router. The engineer wants to ensure that the router does not advertise a specific prefix to any EIGRP neighbor. Which configuration should be used?

A network engineer is deploying MPLS Layer 3 VPNs. The engineer needs to configure the provider edge (PE) routers to support multiple VRFs. Which two statements about VRF configuration on Cisco IOS routers are true? (Choose two.)

A network engineer is troubleshooting an OSPFv3 network. Router R1 is configured with `ipv6 unicast-routing` and OSPFv3 is enabled on all interfaces. R1's neighbor table shows a neighbor in EXSTART state, but the adjacency never progresses to FULL. What is the most likely cause?

A network administrator is configuring a route-map to control redistribution from OSPF into EIGRP. The goal is to redistribute only routes with a tag of 100 and set their metric to bandwidth 1000, delay 100, reliability 255, loading 1, and MTU 1500. Which route-map configuration accomplishes this?

A network engineer is troubleshooting OSPFv3 adjacency issues on a Cisco IOS XE router. The engineer suspects that OSPFv3 is not forming an adjacency because of mismatched parameters. Which two parameters must match for an OSPFv3 adjacency to form? (Choose two.)

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